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Dear Sir,does it mean "modulating duty",it means can control the valve by a singal.
for more informaion,can refer to http://www.valve-actuator.org/Multi-turn-Valve-Actuator/118.html
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∙ 11y ago
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What is the Cost of pneumatic control valve product?
Pneumatic process control valves are used in process industries to control the flow of fluid by using pneumatic actuators. It requires 4.5 to 6 Kg/sq. cm of pressure to operate the valve. Control room sends electrical signals of 4-20 ma to field where I/P converter converts these electrical signals into pneumatic signals. Actuators use these signals to operate the valve. Actuators moves the stem up and down depending upon input signals and control the valve opening. 4ma- 0% opening 8ma- 25% opening 12ma- 50% opening 16ma- 75% opening 20ma- 100% opening
What is the difference between a control valve and a gate valve in a stand pipe system?
a gate valve is a one way totally open or closed valve, a control valve is a variable valve.
What are the Application of control valve with positioner?
One of the application of the control valve with positioner is that it is used to control the opening and closing of the actuator based on electric or pneumatic signals. The opening or closing of control valves is usually done automatically by electrical, hydraulic or pneumatic actuators.
What the function of motor operated valve actuator?
The main function of a valve actuator is to control the valves ON to Close or modulating the valve,and the motor operated valve actuator is one important kind of valve actuator,the main different between kind valve actuators is it drive by electric power.
What is pneumatic actuator?
A pneumatic actuator converts energy (in the form of compressed air, typically) into motion. The motion can be rotary or linear, depending on the type of actuator. Some types of pneumatic actuators include: * Tie rod cylinders * Rotary actuators * Grippers * Rodless actuators with magnetic linkage or rotary cyclinders * Rodless actuators with mechanical linkage * Pneumatic artificial muscles * Speciality actuators that combine rotary and linear motion--frequently used for clamping operations * Vacuum generators A Pneumatic actuator mainly consists of a piston, a cylinder, and valves or ports. The piston is covered by a diaphragm, or seal, which keeps the air in the upper portion of the cylinder, allowing air pressure to force the diaphragm downard, moving the piston underneath, which in turn moves the valve stem, which is linked to the internal parts of the actuator. Pneumatic actuators may only have one spot for a signal input, top or bottom, depending on action required. Valves require little pressure to operate and usually double or triple the input force. The larger the size of the piston, the larger the output pressure can be. Having a larger piston can also be good if air supply is low, allowing the same forces with less input. These pressures are large enough to crush object in the pipe. On 100 kPa input, you could lift a small car (upwards 1,000 lbs) easily, and this is only a basic, small pneumatic valve. However, the resulting forces required of the stem would be too great and cause the valve stem to fail. This pressure is transferred to the valve stem, which is hooked up to either the valve plug (see plug valve), butterfly valve etc. Larger forces are required in high pressure or high flow pipelines to allow the valve to overcome these forces, and allow it to move the valves moving parts to control the material flowing inside. Valves input pressure is the "control signal." This can come from a variety of measuring devices, and each different pressure is a different set point for a valve. A typical standard signal is 20-100 kPa. For example, a valve could be controlling the pressure in a vessel which has a constant out-flow, and a varied in-flow (varied by the actuator and valve). A pressure transmitter will monitor the pressure in the vessel and transmit a signal from 20-100 kPa. 20 kPa means there is no pressure, 100 kPa means there is full range pressure (can be varied by the transmiters calibration points). As the pressure rises in the vessel, the output of the transmitter rises, this increase in pressure is sent to the valve, which causes the valve to stroke downard, and start closing the valve, decreasing flow into the vessel, reducing the pressure in the vessel as excess pressure is evacuated through the out flow. This is called a direct acting process. http://en.wikipedia.org/wiki/Pneumatic_actuator
What brands carry valve actuators that don't require battery backup?
Emerson Process Management is a manufacturer brand that sells a majority of the control valve actuators on the market today. Other brands include Parker Hannifin Corp., Conbraco Apollo, and Flowserve
What do valve actuators do on mechanical pipework?
this is related to the amount of fluid required in the system. In most cases, the valve is equipped with a scale to indicate the percentage of flow that passes through this valve.
What has the author William Walker Clark written?
William Walker Clark has written: 'A planar comparison of actuators for vibration control of flexible structures' -- subject(s): Variable geometry trusses, Actuators, Flexible structures, Vibration
What is a spool type hydraulic valve used to control?
Hydraulic actuators. Also called hydraulic rams or hydraulic cylinders.
What is a variable valve timing (vvt)?
According to Wikipedia, a variable valve timing is a "process of altering the timing of a valve lift event, and is often used to improve performance, fuel economy or emissions".
What is vvt in dodge hemi?
Variable valve timing.
What is vtvt engine?
Variable timing valve train
What is the Cost of pneumatic control valve product?
Pneumatic process control valves are used in process industries to control the flow of fluid by using pneumatic actuators. It requires 4.5 to 6 Kg/sq. cm of pressure to operate the valve. Control room sends electrical signals of 4-20 ma to field where I/P converter converts these electrical signals into pneumatic signals. Actuators use these signals to operate the valve. Actuators moves the stem up and down depending upon input signals and control the valve opening. 4ma- 0% opening 8ma- 25% opening 12ma- 50% opening 16ma- 75% opening 20ma- 100% opening
What is the difference between a control valve and a gate valve in a stand pipe system?
a gate valve is a one way totally open or closed valve, a control valve is a variable valve.
What is vris on a 1993 Ford Probe?
VRIS stand for variable resonance induction system, a set of solenoids and vacuum actuators that help to improve low end Torque
Different types of actuators in automotive industry?
types of actuators in automobiles
What is a variable valve timing solenoid?
This component is electrically operated by the engine computer. It (on most vehicles) changes the oil pressure in the variable valve timing system to adjust the valve timing. It is very similar to the solenoids in use inside an automatic transmission.
